Camera can't be changed to another
I figured it out with the 3pointedit post.

I had to set the Local Camera option to the proper object(camera in my case).
I used to just change the Scene's camera but apparently do not work anymore. At least I know another way to change it. 



[Update]

Here is the button I hitted by mistake :



Now I can change the active camera directly from the scene menu.


Button active : only camera can be selected as camera from the Scene menu.
Button inactive : Camera in Scene menu do nothing, but in the first picture, you can set any object as a camera.